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From Oregon Health Sciences University (Dr. Cereghino), Portland; Arkansas Epilepsy Program (Dr. Biton), Little Rock; Vanderbilt Medical Center (Dr. Abou-Khalil), Nashville, TN; University of Virginia Hospital (Dr. Dreifuss
), Charlottesville; UCB Pharma (L.J. Gauer), Smyrna, GA; and the Minnesota Comprehensive Epilepsy Program (Dr. Leppik), Minneapolis.
Address correspondence and reprint requests to Dr. James J. Cereghino, Oregon Health Sciences University, 3181 SW Sam Jackson Park Rd. CDW-3, Portland, OR 97201-3098.
OBJECTIVE: To evaluate the efficacy and safety of 500 mg bid and 1500 mg bid levetiracetam as adjunctive therapy for refractory partial seizures in a double-blind, randomized, placebo-controlled, parallel-group, multicenter trial.
METHODS: The authors studied patients with uncontrolled partial seizures (minimum 12 per 12 weeks), regardless of whether they became secondarily generalized, for 38 weeks. A 12-week baseline was followed by random assignment to adjunctive therapy with placebo (n = 95), levetiracetam 1000 mg/day (n = 98), or levetiracetam 3000 mg/day (n = 101). Upward titration over 4 weeks was followed by 14 weeks of fixed dose treatment, and concluded with an 8-week medication withdrawal period or entering a follow-up study.
RESULTS: Of 294 patients randomized, 268 completed the study. Partial seizure frequency during the entire evaluation period (primary efficacy variable) was lower with levetiracetam compared to placebo (p
0.001 for both groups). More patients responded (defined as minimum 50% reduction in partial seizure frequency) to levetiracetam than placebo, with rates of 33.0% in the 1000 mg/day and 39.8% in the 3000 mg/day group, compared to 10.8% in the placebo group (p < 0.001). Of 199 patients receiving levetiracetam, 11 became seizure free; no patient became seizure free in the placebo group. Treatment-emergent adverse events (
10%), mostly mild to moderate in severity, with incidences higher than placebo were asthenia, dizziness, flu syndrome, headache, infection, rhinitis, and somnolence.
CONCLUSION: Adjunctive therapy with levetiracetam was effective and well tolerated in controlling partial seizures.
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